The Assam forces, under Lachit Borphukan, unable to match the Mughals on land, were able to win the decisive Battle of Saraighat on the Brahmaputra river which forced Ram Singh to retreat back to Mughal territory.
The Battle of Saraighat was fought in 1671 between the Mughal empire (led by the Kachwaha king, Raja Ramsingh I), and the Ahom Kingdom (led by Lachit Borphukan) on the Brahmaputra river at Saraighat, now in Guwahati.
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People who had dispersed due to Mir Jumla's invasion were rehabilitated in the appropriate khels, food and military productions were increased, new forts were constructed and garrisoned and an experditionary army was organized under a new commander—Lachit Borphukan.
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Their commander-in-chief, Lachit Borphukan and their admiral were both seriously ill, and the Nara Raja, the son of the Miri Sandikoi, was in command.
After this victory, Lachit Borphukan, after obtaining permission from Ahom king Swargadeo Udayaditya Singha, installed Gandharva Narayan as the king of Beltola.
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When he was still a prince, he joined the Ahom forces led by Lachit Borphukan against the invading Mughal forces led by Raja Ram Singh I of Amber and participated in the famous Battle of Saraighat, in which the Ahoms won a decisive victory against the Mughals.
Chakradhwaj Singha also ordered his Prime Minister Atan Burhagohain, a skilled soldier, military engineer and diplomat to accompany Lachit Borphukan on the campaign to oust the Mughals from Assam.